SOLUTION: a father is 39 years old and his son is 15 years old. after how many years the age of the father becomes 3 times the age of his son

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Question 340358: a father is 39 years old and his son is 15 years old. after how many years the age of the father becomes 3 times the age of his son
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let X be the number of years until the father is 3 times the son's age,
F=3S
%2839%2BX%29=3%2815%2BX%29
39%2BX=45%2B3X
2X=-6
X=-3
It happened three years ago when the father was 36 and the son was 12.